CIRCUIT BREAKERSElectrical Distribution SystemsSummaryThe important information covered in this chapter is summarized below.Circuit Breaker SummaryThe purpose of a circuit breaker is to provide a means for connecting anddisconnecting circuits of relatively high capacities without causing damage tothem.The three most commonly-used automatic trip features for a circuit breaker areovercurrent, underfrequency, and undervoltage.ES-15 Page 14 Rev. 0